146 lines
5.1 KiB
C
146 lines
5.1 KiB
C
/****************************************************************************
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* sched/exit.c
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*
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* Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "os_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Functionss
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: exit
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*
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* Description:
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* The exit() function causes normal process termination
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* and the value of status & 0377 is returned to the parent.
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*
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* All functions registered with atexit() and on_exit() are
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* called, in the reverse order of their registration.
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*
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* All open streams are flushed and closed. Files created
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* by tmpfile() are removed.
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*
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****************************************************************************/
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void exit(int status)
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{
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#if CONFIG_NFILE_STREAMS > 0 || defined(CONFIG_SCHED_WAITPID) || defined(CONFIG_SCHED_ATEXIT)
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_TCB *tcb = (_TCB*)g_readytorun.head;
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#endif
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/* Only the lower 8 bits of the exit status are used */
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status &= 0xff;
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/* Flush all streams (File descriptors will be closed when
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* the TCB is deallocated.
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*/
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#if CONFIG_NFILE_STREAMS > 0
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(void)lib_flushall(tcb->streams);
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#endif
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/* Wakeup any tasks waiting for this task to exit */
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#ifdef CONFIG_SCHED_WAITPID /* Experimental */
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while (tcb->exitsem.semcount < 0)
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{
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/* "If more than one thread is suspended in waitpid() awaiting
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* termination of the same process, exactly one thread will return
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* the process status at the time of the target process termination."
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* Hmmm.. what do we return to the others?
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*/
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if (tcb->stat_loc)
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{
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*tcb->stat_loc = status << 8;
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tcb->stat_loc = NULL;
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}
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/* Wake up the thread */
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sem_post(&tcb->exitsem);
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}
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#endif
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/* If an exit function was registered, call it now. */
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#ifdef CONFIG_SCHED_ATEXIT
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if (tcb->exitfunc)
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{
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(*tcb->exitfunc)();
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}
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#endif
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/* Then "really" exit */
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_exit(status);
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}
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